Aster Jen'allé
Bio-engineered Bad queen
Luke does train her in force skills. More importantly: he trains her in what the force actually is. Now she can use that (not to mention the ancient jedi texts that are in her possession) to feel the force out for herself since she is so strong. She has been trained with melee weapons, she was a scavenger on a lawless planet for gods sakes, and that DOES apply to basic lightsaber combat. (to this little tidbit where you say, "then why doesn't the entire galaxy just use lightsabers?" Because: not everyone is force sensitive. Rey is strong in the force and thus has the reflexes to utilize a lightsaber when combined with her martial skill with other melee weapons.)Disdain for Muggles said:Rey is never said to have been trained by anyone, and Luke never actually trains her in any Force skills. If melee combat is so easily translated to lightsabers then why doesn't the entire galaxy just use lightsabers? If anything, Rey's abilities make even less sense than before because not only does she wield a lightsaber, fly ships, defeat trained warriors, and move huge objects without any training, you now can't even use the cop-out explanation that she has Skywalker blood because her parents were nobodies.
Star Wars was always a mythological story. Now that Rian Johnson successfully deconstructed that, it's nothing. This is only a positive if you enjoy subverting things.
She doesn't move huge objects without training, she WAS trained so ignoring this point. She does defeat a trained warrior, but she is also a trained warrior. In fact, in the fight with Kylo literally everything was in her favor. Snoke says it better than I can when he states that Kylo was split in two when he murders Han Solo. He wasn't a confident trained warrior, he was an upset boy who just killed his father (not to mention getting shot by a bloody bowcaster and fighting with blood loss on a snow-cold planet against TWO people including a first order stormtrooper who was taught melee combat as a part of his basic training).
As to your second point, Star Wars was based on mythology, and the lovely thing about mythology is that it HUMANIZES its main characters. Almost any hero in mythology has a tragic flaw: Odysseus had his arrogance, Hercules murdered his wife and kids, and there are plenty more examples. Rian Johnson humanized Star Wars, and did what was necessary to propel it forward without dismissing what came before. Now, thanks to his efforts (and assumin JJ doesn't completely regress) our children can experience a Star Wars just as impactful as our originals instead of watching the same shitty nostalgia trip over, and over, and over, and over, and over again.